﻿var $z = function (id) {
    return "string" == typeof id ? document.getElementById(id) : id;
};

var Class = {
    create: function () {
        return function () {
            this.initialize.apply(this, arguments);
        }
    }
}

Object.extend = function (destination, source) {
    for (var property in source) {
        destination[property] = source[property];
    }
    return destination;
}

var TransformView = Class.create();
TransformView.prototype = {

    initialize: function (container, slider, parameter, count, options) {
        if (parameter <= 0 || count <= 0) return;
        var oContainer = $z(container), oSlider = $z(slider), oThis = this;

        this.Index = 0;

        this._timer = null;
        this._slider = oSlider;
        this._parameter = parameter;
        this._count = count || 0;
        this._target = 0;

        this.SetOptions(options);

        this.Up = !!this.options.Up;
        this.Step = Math.abs(this.options.Step);
        this.Time = Math.abs(this.options.Time);
        this.Auto = !!this.options.Auto;
        this.Pause = Math.abs(this.options.Pause);
        this.onStart = this.options.onStart;
        this.onFinish = this.options.onFinish;

        oContainer.style.overflow = "hidden";
        oContainer.style.position = "relative";

        oSlider.style.position = "absolute";
        oSlider.style.top = oSlider.style.left = 0;
    },

    SetOptions: function (options) {
        this.options = {
            Up: true,
            Step: 5,
            Time: 10,
            Auto: true,
            Pause: 6000,
            onStart: function () { },
            onFinish: function () { }
        };
        Object.extend(this.options, options || {});
    },

    Start: function () {
        if (this.Index < 0) {
            this.Index = this._count - 1;
        } else if (this.Index >= this._count) { this.Index = 0; }

        this._target = -1 * this._parameter * this.Index;
        this.onStart();
        this.Move();
    },

    Move: function () {
        clearTimeout(this._timer);
        var oThis = this, style = this.Up ? "top" : "left", iNow = parseInt(this._slider.style[style]) || 0, iStep = this.GetStep(this._target, iNow);

        if (iStep != 0) {
            this._slider.style[style] = (iNow + iStep) + "px";
            this._timer = setTimeout(function () { oThis.Move(); }, this.Time);
        } else {
            this._slider.style[style] = this._target + "px";
            this.onFinish();
            if (this.Auto) { this._timer = setTimeout(function () { oThis.Index++; oThis.Start(); }, this.Pause); }
        }
    },

    GetStep: function (iTarget, iNow) {
        var iStep = (iTarget - iNow) / this.Step;
        if (iStep == 0) return 0;
        if (Math.abs(iStep) < 1) return (iStep > 0 ? 1 : -1);
        return iStep;
    },

    Stop: function (iTarget, iNow) {
        clearTimeout(this._timer);
        this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
    }
};

window.onload = function () {

    var tab = document.getElementById('tabHome');
    tab.className = 'hover';
    //------------------以上为tab

    function Each(list, fun) {
        for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
    };

    var objs = $z("idNum").getElementsByTagName("li");

    var tv = new TransformView("View", "idSlider", 293, 4, {//显示广告数
        onStart: function () { Each(objs, function (o, i) { o.className = tv.Index == i ? "on" : ""; }) }//按钮样式
    });

    tv.Start();

    Each(objs, function (o, i) {
        o.onmouseover = function () {
            o.className = "on";
            tv.Auto = false;
            tv.Index = i;
            tv.Start();
        }
        o.onmouseout = function () {
            o.className = "";
            tv.Auto = true;
            tv.Start();
        }
    })
}
